Geometrical instruments – Area integrators – Electrical
Patent
1982-03-18
1984-06-19
Little, Willis
Geometrical instruments
Area integrators
Electrical
33178F, G01B 312
Patent
active
044546556
ABSTRACT:
A distance measuring tool is provided for measuring the length of a drill pipe maintained under tension within a well. The tool includes a unitary instrumentation and instrument drive module which is sealed within an instrument housing and which may be removed and replaced as a single unit when malfunction occurs. The moving parts of the module are sealed in lubricating fluid, and a pressure equalization system is provided to equalize the pressure of the lubricating fluid relative to the external drilling mud pressure. The instrumentation and instrument drive module includes a mechanical distance counter and a drive mechanism which drives the counter only when the tool is descending into a drill pipe. The instrumentation within the tool is protected against impact by a shock absorbing nose assembly which includes both mechanical spring and hydraulic shock absorbing units. The shock absorbing nose assembly is mounted for limited universal movement on the tool housing to guide the tool over obstructions in the pipe.
REFERENCES:
patent: 2245221 (1941-06-01), Nudson et al.
patent: 2292938 (1942-08-01), Hennessy
patent: 3134175 (1964-05-01), Potts
patent: 4163323 (1979-08-01), Bud
Little Willis
Van Zandt Hillard C.
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